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Linux - Virtualization and Cloud This forum is for the discussion of all topics relating to Linux Virtualization and Linux Cloud platforms. Xen, KVM, OpenVZ, VirtualBox, VMware, Linux-VServer and all other Linux Virtualization platforms are welcome. OpenStack, CloudStack, ownCloud, Cloud Foundry, Eucalyptus, Nimbus, OpenNebula and all other Linux Cloud platforms are welcome. Note that questions relating solely to non-Linux OS's should be asked in the General forum.

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Old 10-27-2009, 05:38 AM   #1
sparkshankar
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Different virtualization technologies


Hello,

I went through lot of Internet articles on the following topics but i got confused . So anybody please clearly explain the following questions

1) what are the differences between full virtualization and paravirtualization ?

2) which does xen and kvm uses ?

3) what is a hypervisor ? Does a hypervisor operate on top of a Linux kernel or are they codes present as part of the kernel or are they present directly on top of the hardware ?

4) Are xen and kvm hypervisors ?

5) what about the virtualization technologies of hyper-v , QEMU , VMware ? How much are they different from xen and kvm ? Are they hypervisors too ? Are they fully virtualized or paravirtualized ?

6) what are Emulators ?


Thanks & Regards
Shankar.S
http://migrate2cloud.com
Email : shankar@sparksupport.com
 
Old 10-27-2009, 07:18 AM   #2
zhjim
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All writen below is from mind and might not hold to the fullest content of available knowledge
Quote:
Originally Posted by sparkshankar View Post
1) what are the differences between full virtualization and paravirtualization ?
Paravirtualisation requires a kernel that is aware of that it's beeing virtualiest. Full virutalisation is a CPU option. So to speak the CPU handles certain calls in a diffrent way.
Background on this is that you have 4 possible rings inside the CPU. Normally kernel lifes at ring 0? and the OS at ring 3.
Ring 3 does not allow every CPU command but ring 0 does. Like moving memory and alike. There are also certain interrupts that need ring 0 if I recall right.
So if the virutaliest OS wants to do certain task it need access to ring 0 which it normaly is not allowed to. Here the hypervisor comes into play. It catches those cpu commands.

Quote:
Originally Posted by sparkshankar View Post
2) which does xen and kvm uses ?
Xen is a paravirtualisation only technology. Thus it needs a virtualisation aware kernel.
KVM is capable of both with the use of qemu.
(Not so sure I read about windows OS running within XEN...)

Quote:
Originally Posted by sparkshankar View Post
3) what is a hypervisor ? Does a hypervisor operate on top of a Linux kernel or are they codes present as part of the kernel or are they present directly on top of the hardware ?
Not sure about it. So I better not tell anything false or incomplete

Quote:
Originally Posted by sparkshankar View Post
4) Are xen and kvm hypervisors ?
I'd say yes but see above.

Quote:
Originally Posted by sparkshankar View Post
6) what are Emulators ?
Emulators take the assembler code that a programm present and emulate the cpu calls onto the cpu thats inside the compute your using the Emulator on. Emulator normaly go line by line, see what the cpu thats emulated would do and translate it to their cpu internals.




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